Switching Regulator Digital Control for Stable Voltage Transitions
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Solution Overview
Problem
Conventional switching regulators face instability and poor response characteristics during output voltage changes due to discrepancies between compensation coefficients and output voltage settings, leading to oscillations and prolonged recovery times, especially when load currents fluctuate.
Innovation Solution
A digital control method that dynamically adjusts compensation coefficients by calculating a fixed duty factor and assigning it to the controller, allowing for optimal control during output voltage changes, thereby maintaining stability and response quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional switching regulators use fixed compensation coefficients during output voltage changes, then the circuit structure remains simple, but the output voltage becomes unstable with oscillations and poor response characteristics
Solution Approach 1:
The patent applies dynamics by making the compensation coefficients variable rather than fixed. The controller dynamically adjusts compensation coefficients based on the current operating state (output voltage level and load current), allowing the system to adapt to changing conditions and maintain stability across different output voltage settings without requiring a completely redesigned control circuit.
Solution Approach 2:
The patent changes the parameters of the control system by adjusting compensation coefficients according to output voltage levels and load conditions. By modifying these control parameters dynamically, the system achieves stable output voltage across different operating points without increasing the fundamental circuit structure complexity.
2Speed
If switching regulators use dynamic output voltage change control, then response characteristics improve, but oscillations occur due to mismatched compensation coefficients
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal compensation coefficients for different output voltage levels and load current conditions. When an output voltage change is detected, the controller immediately retrieves the pre-prepared compensation coefficients corresponding to the new operating state, enabling fast response without oscillations caused by coefficient mismatch.
Solution Approach 2:
The patent uses feedback by continuously monitoring output voltage and load current to determine the current operating state. Based on this feedback information, the controller selects appropriate compensation coefficients from stored values, ensuring that the system maintains stability while achieving fast response during output voltage transitions.
3Adaptability or versatility
If conventional regulators use DAC circuits for voltage setting control, then output voltage can be dynamically adjusted, but packaging area increases
Solution Approach 1:
The patent extracts the DAC circuit from the switching regulator and relocates it to the external host device. This removes the voltage-setting DAC from the regulator's internal structure, significantly reducing packaging area while maintaining full digital voltage adjustment capability through communication interfaces between the host and regulator.
Solution Approach 2:
The patent makes the host device universal by having it perform multiple functions: it not only controls the switching regulator but also houses the voltage-setting DAC circuit. This consolidates functions and reduces the overall system footprint by eliminating redundant components.
Data Source
AI summary
A switching regulator can convert an input voltage to a desired output voltage by ON-OFF controlling switching elements with PWM signals. The switching regulator can include a communication interface circuit that receives external operation instructions, an output voltage setting section that changes an output voltage to an output voltage setting value upon receiving an output voltage changing instruction from the outside, a voltage divider and an ADC that converts an error voltage into a digital error signal e[n], the error voltage being a difference between a reference voltage Vref and a detected output voltage value Vfb. The switching regulator can also include a controller that includes an operation control section for calculating a duty factor signal d[n] to determine an ON time proportion of the switching elements and an output voltage changing control section for controlling operation to change the output voltage.